Hull survived a fightback from Leeds to beat the Rhinos, while London Broncos beat the controversial second-string St Helens line-up.
- Leeds 24-26 Hull
- London 32-12 St Helens
- Salford 40-14 Catalans
- Castleford 27-18 Warrington
Hull hold off Leeds fightback
Hull held off a spirited fightback by relegation-threatened Leeds to pull off their first win at Headingley for 12 years in dramatic fashion.
The Rhinos came from 20-6 down to go in front for the first time thanks to three tries in a blistering 13-minute spell, but Hull winger Ratu Naulago levelled with a try 11 minutes from time and Marc Sneyd landed the touchline conversion to secure a 26-24 victory.
The result ended Leeds' run of 14 successive home wins over the Black and Whites and their misery was compounded by London Broncos' victory over St Helens that means they are among three teams level on 16 points at the foot of the table.
The win keeps Hull firmly on course for a third-place finish and sets them up nicely for next Saturday's Challenge Cup semi-final against Warrington.
Broncos beat second-string Saints
An excellent all-round performance by London Broncos secured a crucial 32-12 victory in their attempt to stave off relegation over a second-string St Helens side.
The first score of the game in Ealing came in rather strange circumstances as Jordan Abdull's cross-field kick found its way into Matty Fleming's hands as he went up unchallenged for the high ball.
He just waltzed through to score under the posts, with Kieran Dixon adding the conversion to give them an early 6-0 lead - and that was indicative of a dis-jointed Saints display.
With Leeds and Hull KR both losing this weekend, the Broncos now sit in a three-way tie on 16 points at the foot of the table, albeit with the worst points difference of the three.
Salford boost play-off hopes
Salford gave their Betfred Super League play-off hopes a huge boost as they saw off fellow top-five hopefuls Catalans Dragons with a 40-14 win at the AJ Bell Stadium.
Centre Kris Welham marked his 300th career appearance with two tries but it was Tui Lolohea - a recent signing from Leeds - who was the key man for Salford, scoring his first try for the club, kicking three goals and providing three assists.
His half-back partner Jackson Hastings was also hugely influential for Salford as they followed up their memorable 46-0 win over the Dragons in France back in March.
Cas creep up into top five
Castleford climbed back into Super League's top five after Peter Mata'utia kicked them to a hard-fought 27-18 victory over Warrington.
The Tigers handed the Wolves their second loss in a row, and leapfrogged Catalans into fifth place, with a tight eight-point win at the Mend-A-Hose Jungle.
The kicking of Mata'utia proved the difference in a see-sawing contest as the Australian nailed five from seven with the boot.
Castleford's third victory in four matches moves them ahead of the Dragons, who went down 40-14 to Salford, on points difference.